Schrader specializes in developing and producing high-quality engine purge valves. Schrader’s purge valves are used to purge the engine before delivery, and to make direct pressure measurements in the engine during service. Schrader’s engine purge valves consist of a Schrader core screwed into a metal body (brass, nickel-plated brass, or anodized aluminum). Most valves are mounted in the engine injection rail. A seal on the valve body ensures sealing with the engine or rail, and a sealed cap protects the completed system.